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issue-44851.rs
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// check-pass
macro_rules
!
a
{
()
=>
{
"a"
}
}
macro_rules
!
b
{
(
$doc
:
expr
)
=>
{
#[
doc
=
$doc
]
pub
struct
B
;
}
}
b
!(
a
!());
fn
main
()
{}